Datasheet

OUT+
OUT-
DS15BA101
IN+
IN-
50: 50:
100: Differential T-Line
LVPECL
100:
OUT+
OUT-
DS15BA101
IN+
IN-
50:50:
V
CC
CML3.3V or CML2.5V
100:
100: Differential T-Line
OUT+
OUT-
DS15BA101
IN+
IN-
100:
100: Differential T-Line
LVDS
DS15BA101
SNLS234J –OCTOBER 2006–REVISED APRIL 2013 www.ti.com
DEVICE OPERATION
INPUT INTERFACING
The DS15BA101 accepts either differential or single-ended input. The inputs are self-biased, allowing for simple
AC or DC coupling. DC-coupled inputs must be kept within the specified common-mode range. The IN+ and IN-
pins are self-biased at approximately 2.1V with V
CC
= 3.3V. The following three figures illustrate typical DC-
coupled interface to common differential drivers.
Figure 2. Typical LVDS Driver DC-Coupled Interface to DS15BA101 Input
Figure 3. Typical CML Driver DC-Coupled Interface to DS15BA101 Input
Figure 4. Typical LVPECL Driver DC-Coupled Interface to DS15BA101 Input
OUTPUT INTERFACING
The DS15BA101 uses current mode outputs. Single-ended output levels are 400 mV
P-P
into AC-coupled 100Ω
differential cable (with R
VO
= 953Ω) or into AC-coupled 50Ω coaxial cable (with R
VO
= 487Ω). Output level is
controlled by the value of the R
VO
resistor connected between the R
VO
and V
CC
.
The R
VO
resistor should be placed as close as possible to the R
VO
pin. In addition, the copper in the plane layers
below the R
VO
network should be removed to minimize parasitic capacitance. The following figure illustrates
typical DC-coupled interface to common differential receivers and assumes that the receivers have high
impedance inputs. While most receivers have a common mode input range that can accomodate CML signals, it
is recommended to check respective receiver's datasheet prior to implementing the suggested interface
implementation.
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